Musannaf Ibn Abi Shayba 19:387

Abu Bakr narrated to us, he said: Abd al-Salam narrated to us, from Mughira, from Ibrahim, regarding a man who performs *li'an* (imprecation) with his wife, then accuses her (of adultery again): He said: He is to be lashed. And 'Amir said: He is not to be lashed.